Add transfer softkey to ringout state to enable blond transfers.

(closes issue ASTERISK-21327)
Reported by: wedhorn
Tested by: myself
Patches: 
    skinny-blindxfer01.diff uploaded by wedhorn (license 5019)


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@389164 f38db490-d61c-443f-a65b-d21fe96a405b